Browse Prior Art Database

Head Crash Detector

IP.com Disclosure Number: IPCOM000074553D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 17K

Publishing Venue

IBM

Related People

Dushkes, SZ: AUTHOR [+2]

Abstract

A transistor 3 is mounted on the underside of slider 1 and is thermally isolated from slider 1. A head sensing element 2 is also mounted on the underside of slider 1 and is used for normal read/write purposes.

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Head Crash Detector

A transistor 3 is mounted on the underside of slider 1 and is thermally isolated from slider 1. A head sensing element 2 is also mounted on the underside of slider 1 and is used for normal read/write purposes.

Transistor 3 is used to measure the distance between slider 1 and disk 4. It is well-known that the V(BE) characteristic of a transistor is temperature sensitive. Transistor 3 is powered by a constant current source and disk 4 acts as a heat sink for the heat generated by transistor 3. Since the characteristics of transistor 3 are a function of its temperature, the nearness of a heat sink such as disk 4 will vary the V(BE) characteristic of that transistor. By monitoring this characteristic of transistor 3, impending head crashes can be sensed.

Further if the V(BE) characteristic of transistor 3 is calibrated, then the V(BE) characteristic can be used as a dynamic measurement of the distance between slider 1 and disk 4.

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